Successively operated independent



April 1, 1952 E K 2,591,064

SUCCESSIVELY 'OPERATED INDEPENDENT AcTuAToR TENs TRANSFER MECHANISM Filed March 5, 1951 3 Sheets-Sheet 1 ATTORNEYS April 1, 1952 a K. GRIP 2,591,064

SUCCESSIVELY OPERATED INDEPENDENT ACTUATOR TENS TRANSFER MECHANISM Filed larch 5, 1951 5 Sheets-Sheet 2 fJd /4a ATTORNEY? E. K. GRIP SUCCESSIVELY OPERATED INDEPENDENT ACTUATOR TENS TRANSFER MECHANISM April 1, 1952 3 Sheets-Sheet 3 Filed March 5, 951

Patented Apr. 1, 1952 SUCCESSIVELY OPERATED INDEPENDENT ACTUATOR TENS TRANSFER MECHANISM Erik K. Grip, Atvidaberg, Sweden, assignor to Aktiebolaget Atvidaberg-Facit,

Atvidaberg,

Sweden, a. joint-stock company of Sweden Application March 5, 1951, Serial No. 213,845 In Sweden March 17, 1950 2 Claims.

The present invention relates to a tens transfer mechanism for products and quotient registers in calculating machines and the like of the type in which an additional tens transfer tooth is engaged (rendered operative) by means of axially movable tens transfer elements.

Tens transfer mechanism of this kind for products and quotient registers are already known and exist in several embodiments. Thus, reliable but very complicated mechanisms are known, the only drawback of which has been the too high costs of manufacture. Therefore, calculating machines were often manufactured Without tens transfer mechanisms in the quotient register (revolutions counter) ,-but this forces the operator himself to keep count of the number of revolutions of the actuator, as soon as tens transfers occurred.

Simpler solutions of the problem have been proposed which have also been applied in the practice. These constructions, however, have turned out to function less reliably, because such small tolerances (exactness of dimensions) as are necessary for a reliable functioning of the mechanism, could not be attained at reasonable costs.

The present invention relates to an improvement of such a simple, well-known construction and has for its purpose to lower the costs of manufacture, while simultaneously designing the mechanism to function reliably without particularly small tolerances of dimensions being necessary.

The tens transfer mechanism according to the invention is mainly characterized in that a hook is provided with two arms or projections, arranged in relation to each other in such a way that the projections cooperate with two conical surfaces located on the tens transfer element and facing in opposite directions, so that the arms or projections effect a positive displacement of the said element to two different positions when the hook moves from one position to another between said conical surfaces.

A preferred embodiment of the invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 shows a perspective View of a tens transfer mechanism in accordance with the invention and seen obliquely from its rear side, certain parts being omitted for the sake of clearness. Fig. 2 shows an end view of the elements for one denomination in an accumulator or a revolutions counter with a tens transfer mechanism according to the invention. Fig. 3 shows a section on the broken line III-III in Fig. 2. Fig. 4 shows the same view as Fig. 2, the parts being in another position. Fig. 5 shows a rear view of the elements shown in Fig. 4 (and is thus a view from the right in Fig. 4;). Finally, Fig. 6 shows a detail of a tens transfer element, in end view.

A so-called revolutions counting tooth or revolutions counter actuator l which enters a unit into the revolutions counter for each revolution of the main actuator (rotor) proper is secured to (keyed on) a shaft 2, which in well-known manner is mounted in the stationary frame of the calculating machine (not shown in the draw ings). The shaft 2 for the revolutions counting tooth i is in permanent mesh with the rotor of the calculating machine via a toothed wheel gearing of well-known construction (not shown in the drawing) The revolutions of the tooth I (and of said shaft 2) are transmitted to a toothed cylinder 1 via toothed wheels 3, 4, 5 and 6. Like the revolutions counting tooth l these toothed wheels are mounted on shafts, which are non-displaceably journalled in the stationary frame of the calculating machine. The toothed cylinder 1 is rotatably mounted in the frame 3 of the tens transfer mechanism and this frame is an integral part of the movable carriage 9 of the calculating machine.

The toothed whe'el 6 is axially stationary in relation to the frame of the machine and slides along the toothed cylinder 1 when the carriage 9 is displaced, and because the wheel 6 is in permanent mesh with said cylinder, the rotary motion of the wheel 6 is transmitted to said cylinder in all the working positions of the carriage. Thus, said cylinder will always rotate synchronously with the revolutions counting tooth I.

An element shaft I0 is journalled in the frame of the tens transfer mechanism 8 and carries a toothed wheel I! fixed (keyed) to the shaft. This wheel is in permanent mesh with the toothed cylinder 1 and their ratio of gearing is chosen in such manner that the revolutions counting tooth l and the shaft [0 rotate synchronously. that is at the same angular velocity (the same number of revolutions). The arrows in Fig. 1 show the directions in which toothed wheels and other rotary details rotate when the machine is operated in the positive direction direction).

The shaft I0 is provided with a longitudinal key slot, in which a longitudinal key (spline) I2 is arranged, which is provided with a number of teeth or projections 12a protruding from said shaft, one tooth for each denomination of the counter. Furthermore, an element I3 is provided on the shaft for each denomination and this element is axially displaceable a short distance but is prevented from rotating in relation to said shaft due to the fact that one of the teeth 12a of the key 12 engages a slot in the element. Each element is also provided with two teeth I311, I319, one l3a intended for calculating operations in the positive direction and the other l3b for such operations in the negative direction.

The angle 2a between the teeth I3a, I319 (Fig. 6) is increased for each higher denomination, so that the teeth I3a as well as the teeth I31) form a helical curve in well-known manner.

The elements I3 are guided in the axial direction by tens transfer hooks I i, which are rockably mounted on an intermediate shaft I5. In the axial direction said hooks are guided by slots in the parts (rails) 8a, 8b of the frame 8 (Figs. 1 and 2).

The transfer hooks It can be caused to assume two different positions, an inoperative position or position of rest as shown in Fig. 2, and an operative position as shown in Fig. 4. In each of said positions the hook is latched by a ball latch I6 or the'like.

Each transfer hook I4 is provided with two guiding arms or projections I la, I lb, the arm Mb being displaced (set off) in the axial direction in relation to the arm I ia. Said arms are provided with guiding surfaces, which cooperate with conical surfaces I3c, I3d of the respective element I3 in such a manner, that the two different positions of the hook Ill positively determine two different corresponding (axial) positions of the element I3 on the shaft I0.

When the hook I4 assumes its inoperative position (Fig. 2), the element I3 will be retained in a position as shown in dash-and-dot lines in Fig. 5, and when the hook I4 assumes its working position, said element will be in the position as shown in full lines in Fig. 5.

When the calculating machine is in its fullcycle position (initial position), the revolutions counting tooth I assumes the position shown in Fig. 1 and at the same time the key I2 is in the position shown in Fig. 2. The teeth I2a of the key I2 are in the axial direction arranged in such manner that they cooperate with (are in the path of) the guiding surface of the arm Mb, whereas the arm I la is located just in front of a recess in the key I2.

Between the transfer hooks I I on the shaft I5 intermediate toothed wheels (gear wheels) I! are mounted, Which cooperate with the revolutions counter tooth I and with the teeth I3a, Ifib of the elements I3. Each intermediate wheel I7 is in permanent mesh with a numeral wheel I8 which in the usual manner is provided with impressed numerals on its periphery, as suggested in Fig. 6. Each numeral wheel I9 is provided with ten teeth and also has a tens transfer tooth I8a, which cooperates with a tooth I40 or projection (cam) on the tens transfer hook Id. The numeral wheels are mounted on a common shaft I9.

The mode of operation of the described mechanism is as follows:

If the main or actuator shaft of the machine is rotated round in positive direction, the revolutions counter tooth I will rotate in the direction of the arrow shown in Fig. 1, and when said shaft has been rotated about one half revolution, the revolutions counter tooth I begins to rotate the wheel I! and the numeral wheel in mesh with it one step in positive direction. The tooth I31), which is operative in calculating operations in the negative direction, then passes by the intermediate wheel I? without actuating it, because now the hook Ill assumes its inoperative position and thus retains the element I3 in the position shown in dash-and-dot lines in Fig. 5. If new the numeral wheel I8 shows the value 9 as shown in Fig. 2, the tooth I8a will actuate is rocked forwards, i. e. counter-clockwise in Fig. 2. After the wheel I8 has thus been rotated one half step, these parts will thus assume the position shown in Fig. 1. This rocking motion of the hook I4 causes the element I3 to be moved axially to its position'as shown in full lines in Fig. 5, due to the engagement of the arm I la with the respective conical surface of the element I3. Now the tooth I3a is in the same plane (at right angles to the shaft) as the wheel I! of the next higher denomination, and when the rotation of the shaft I 0 is continued, said tooth I311 will rotate the wheel I! and the numeral wheel I8 in mesh therewith one step forward to effect the tens transfer. During the last part of the revolution, i. e. when the revolution is completed, the key I2 will rock the hook It clockwise in Fig. 4 back to its inoperative position (Fig. 2), so that the mechanism is restored to the initial position (position of rest).

When calculating operations are effected in the negative direction the mode of operation is analogous.

The invention is not limited to the embodiment shown. The shape and construction of the various details can be varied considerably within the scope of the following claims.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. Tens transfer mechanism for products and quotient registers of calculating machines of the type in which axially displaceable tens transfer elements are provided with a tens transfer tooth, characterized in that the tens transfer elements are provided with two oppositely directed conical surfaces, and a hook having two projections each of which cooperates with one of said conical surfaces, said hook effecting positive displacement of the tens transfer element to either of two different axial positions when said hook is moved from one of its positions to another between said conical surfaces.

2. Tens transfer mechanism for product and quotient registers of calculating machines of the type in which said registers comprise numeral wheels and have axially displaceable tens transfer elements each provided with a tens transfer tooth, characterized in that each tens transfer element is provided with two oppositely directed conical surface and a hook is arranged between each numeral wheel and cooperating tens transfer element, said hook being actuated by means of a tooth on a corresponding numeral wheel and being also actuated by means of a projection on the shaft which carries said tens transfer elements, each said hook being provided with projections each of which cooperates with one of the two oppositely directed conical surfaces, said projections thereby effecting a positive displacement of the tens transfer element axially in either direction upon movement of the hook from one of its positions between said conical surfaces to another.

ERIK K. GRIP.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,364,618 Dennis Jan. 4, 1921 2,197,291 Beria Apr. 16, 1940 2,306,500 Ronan Dec. 29, 1942 

